For heavy express and fast trains on main lines, the Deutsche Bundesbahn introduced the locomotives of the E 10 series starting in 1956. The machines achieved a top speed of 150 km/h and had a power output of 3,260 kW. During production (starting from E 10 216), the large single lamps were replaced by two smaller lamps (one as a headlight and one as a tail light); this version was designated as E 10.2 according to the running numbers.